Steam-boiler



, (No Model.)

. G. P. HAWEKOTTE.

STEAM BOILER.

No. 592,779. Patented Nov. 2, 1897.

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GEORGE F. HAWEKOTTE, OF CINCINNATI, OHIO.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 592,779, dated November 2, 1897.

Application filed October 15, 1896. Serial No. 609,019. (No model.)

To all whom it may concern.-

Be it known that I, GEORGE F. HAWEKOTTE,

a citizen of the United States, residing at Oincinnati, Ohio, have invented new and useful Improvements in Steam-Boilers, of which the following is a specification.

My invention relates to the class of vertical boilers known as cross-tube boilers, in which a body of return horizontal tubes is maintained within a circular shell usually water-jacketed. In boilers of this type, which are largely used in steam fire-engines and other service where quick steaming is desired, the body of cross-tubes leaves a segmental space adjacent to the inner shell at opposite sides, which is usually partially closed at one or more points by a plate or plates bolted to the shell to prevent the toofree passage of air and gases outside the nest of tubes.

My invention has for its object to increase the heating-surface and consequent efficiency of this class of boilers by inserting in the space described a manifold nest of tubes occupying said space throughout its entire vertical length and connected with the waterjacket above and below, performing the function of the plates, which are discarded, and the additional function above set forth.

It consists also in the construction and mode of attachment of the said manifolds whereby they are easily attached independently of the nest of cross-tubes and are as easily removed.

My invention is illustrated in the accompanying drawings, in which Figure 1 is a vertical section of a vertical water jacketed boiler, showing one of my manifolds in position, the nest of cross-tubes being omitted. Figs. 2 and 3 are top and bottom plan views of the boiler complete with cross-tubes, indicated by dotted lines, and my vertical manifolds.

Referring now to the drawings, A desig nates the outer shell, and a the inner shell, of a cylindrical boiler, arranged with its axis vertical, and B an interior body or nest of horizontal cross-tubes constructed and arranged in the usual manner.

In the arrangement of the nest of crosstubes there is left a space a of segmental cross-section at each side of the body of crosstubes and extending from bottom to top of the nest of tubes. Unfilled this space would leave too open and free a channel for the products of combustion, and the common prac tice is to insert a horizontal plate at about midway of the nest and bolted to the inner shell or, which almost closes the passage and forces the gases of combustion inwardly among the horizontal tubes. This plate being exposed unprotected often burns out and becomes useless, lessening the efficiency of the boiler. This plate I dispense with and insert in the said space a vertical manifold 0, having a top connection 0, carried into the top of the water-jacket at any convenient point, and a bottom connection 0 carried into the inner shell (1, as shown. In the present case I have shown the top connection carried entirely across to the opposite side of the boiler, an arrangement permitting the greatest latitude of expansion and contraction without disturbing joints. The top and bottom connections are each provided with runner-joints b, the removal of which enables the manifold to be taken out. These connections pass, respectively, just above and below the body or nest of horizontal tubes, with which they do not in any manner interfere.

The construction of the manifolds O in other respects is of the ordinary type. The top and bottom castings c c are each curved, viewed from above or below, to a somewhat larger circle than that of the inner shell a, so that when in place a slightly wider space is left centrally between itself and the boiler-shell at one side and the nest of the tubes at the other for the passage of the gaseous products of combustion. Each manifold O is supported at the bottom upon a bracket 00, as shown in Fig. 1, bolted to the inner shell of the boiler. The number and arrangement of the tubes in the manifolds O are not material, as the form and size of the same will depend upon the nature of the space to be 0ccupied. In these boilers there is usually a forced circulation maintained in the central body of tubes, but in the additional manifolds this is not necessary, as the character, position, and boiler connections favor the freest possible natural circulation. For this reason also the additional manifolds with natural circulation act as safety appliances in above and below to the water-jacket independently of the pump, and occupying the space or spaces between the central body of 15 tubes and the inner shell of the boiler, substantially as set forth.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

GEORGE F. IIAWEKOTTE.

Witnesses:

CHRIS. AHRENs, L. M. I'IOSEA. 

